Tula's Cube

This spell can't be countered.
{t}: Place a bone counter on Tula's Cube.
{w/b}: Sacrifice Tula's Cube and choose one:
• Add {x} colorless mana to your pool, where {x} is equal to the number of bone counters.
• Deal {x} damage to any target, where {x} is equivalent to the number of bone counters.
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It's not edible. But people try anyway.